The Experts below are selected from a list of 19686 Experts worldwide ranked by ideXlab platform
Nicholas E. Leadbeater - One of the best experts on this subject based on the ideXlab platform.
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Opening an Aladdin's cave: the Suzuki Coupling in a room-temperature ionic liquid
Chemical Communications, 2014Co-Authors: Nicholas E. LeadbeaterAbstract:This viewpoint will discuss the impact of the 2000 Chem. Commun. report that the palladium-catalysed Suzuki Coupling can be performed quickly and easily in a room-temperature ionic liquid. This work has helped fuel what have now become whole areas of chemistry of their own: the use of ionic liquids as reaction media for catalytic transformations, and the application of palladium complexes bearing N-heterocyclic carbene (NHC) ligands in the Suzuki Coupling and beyond.
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in situ raman spectroscopy as a probe for the effect of power on microwave promoted Suzuki Coupling reactions
Organic and Biomolecular Chemistry, 2007Co-Authors: Nicholas E. Leadbeater, Rebecca J SmithAbstract:We report the use of in situ Raman spectroscopy as a probe for the effect of power on microwave-promoted Suzuki Coupling reactions. We find that increased initial microwave power leads to greater acceleration of the reaction but that the product yield obtained is essentially independent of initial microwave power. The application of simultaneous cooling lengthens the reaction time but does not alter the relative rates of the Suzuki Coupling and deboronation processes. Performing the reaction at an initial microwave power of 5 W leads to an improvement in product yield.
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The application of organic bases in microwave-promoted Suzuki Coupling reactions in water
Tetrahedron Letters, 2006Co-Authors: Florine Chanthavong, Nicholas E. LeadbeaterAbstract:Traditionally, mineral bases are used in Suzuki Coupling protocols. The use of DBU or DABCO as alternative bases for the reaction is reported and the application discussed.
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Suzuki Coupling of aryl chlorides with phenylboronic acid in water using microwave heating with simultaneous cooling
Organic Letters, 2005Co-Authors: Riina K Arvela, Nicholas E. LeadbeaterAbstract:We present here a methodology for the Suzuki Coupling of aryl chlorides with phenylboronic acid using Pd/C as a catalyst, water as a solvent, and microwave heating. We show that simultaneous coolin ...
Kang Hyun Park - One of the best experts on this subject based on the ideXlab platform.
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Platinum single atoms dispersed on carbon nanotubes as reusable catalyst for Suzuki Coupling reaction
Journal of Catalysis, 2017Co-Authors: Eun-kyung Lee, Kang Hyun Park, Shin-ae Park, Hyunje Woo, Dong Wook Kang, Hankwon Lim, Yong-tae KimAbstract:Abstract While a ligand-free condition for Suzuki Coupling reaction is desirable to minimize the separation process of the final product, it adversely has affected a reaction kinetics. Herein, we report a promising candidate for active and recyclable heterogeneous catalyst for ligand-free Suzuki Coupling: Pt single atoms on thiolated multi-walled nanotubes. They demonstrated a complete conversion (>99%) in the ligand-free condition for 24 h, while conventional Pd or Pt complex catalysts showed just below 5% conversion. Also, they could be completely recollected by a simple filtering process and be recycled showing 82% yield retention after 12 cycles.
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Suzuki Coupling reaction using hybrid Pd nanoparticles.
Journal of Nanoscience and Nanotechnology, 2014Co-Authors: Aram Kim, Ji Chan Park, Mijong Kim, Eunjung Heo, Hyunjoon Song, Kang Hyun ParkAbstract:This paper reviews recent developments in the field of hybrid Pd nanoparticles and their catalytic activity in the Suzuki Coupling reaction, which is used extensively in the fabrication of both simple and complex biaryl compounds. We developed three types of Pd-silica hybrid nanoparticles. Pd/SiO2 nanobeads containing tiny Pd clusters, Pd@nickel phyllosilicate yolk-shell nanoparticles, Pd@porous SiO2 yolk-shell nanoparticles were synthesized, and they displayed highly efficient catalytic activity and excellent reusability. The hybrid nanoparticles also catalyzed the Suzuki Coupling reaction with various substrates, including bromobenzene and chlorobenzene. This review also briefly discusses the synthesis procedure, structural characterization, and catalytic activity of hybrid Pd nanoparticles.
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Suzuki Coupling Reaction Using
2014Co-Authors: Aram Kim, Ji Chan Park, Mijong Kim, Eunjung Heo, Hyunjoon Song, Kang Hyun ParkAbstract:This paper reviews recent developments in the field of hybrid Pd nanoparticles and their catalytic activity in the Suzuki Coupling reaction, which is used extensively in the fabrication of both simple and complex biaryl compounds. We developed three types of Pd-silica hybrid nanoparticles. Pd/SiO2 nanobeads containing tiny Pd clusters, Pd@nickel phyllosilicate yolk-shell nanoparticles, Pd@porous SiO2 yolk-shell nanoparticles were synthesized, and they displayed highly efficient catalytic activity and excellent reusability. The hybrid nanoparticles also catalyzed the Suzuki Coupling reaction with various substrates, including bromobenzene and chlorobenzene. This review also briefly discusses the synthesis procedure, structural characterization, and catalytic activity of hybrid Pd nanoparticles.
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Synthesis of Pd/SiO_2 Nanobeads for Use in Suzuki Coupling Reactions by Reverse Micelle Sol–gel Process
Catalysis Letters, 2012Co-Authors: Ji Chan Park, Hyunjoon Song, Kang Hyun ParkAbstract:Pd/SiO_2 nanobeads containing tiny Pd clusters with a diameter of about 2 nm were prepared via a sol–gel process for SiO_2 by using a water-in-oil microemulsion with Pd complexes and subsequent hydrogen reduction by heat treatment. The Pd/SiO_2 nanostructures were employed in Suzuki Coupling reactions with various substrates, and they served as good catalysts in these reactions. Graphical Abstract
Feng-ling Qing - One of the best experts on this subject based on the ideXlab platform.
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synthesis of gem difluoromethylenated biflavonoid via the Suzuki Coupling reaction
Tetrahedron Letters, 2004Co-Authors: Xing Zheng, Weidong Meng, Feng-ling QingAbstract:gem-Difluoromethylenated biflavonoid 1 was synthesized via the Suzuki Coupling reaction. The key intermediate 6-iodonated flavone 4 was regioselectively synthesized by the use of AgOAc/I2 under mild conditions without handling of a strongly toxic reagent. The key step was the formation of a flavone 3′-boronate 3 using a palladium-catalyzed exchange of the corresponding 3′-iodonated flavone with a diboron reagent.
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A Suzuki Coupling approach to trifluoromethyl derivative of targretin (LGD) 1069)
Bioorganic & Medicinal Chemistry Letters, 1997Co-Authors: Feng-ling Qing, Junfa FanAbstract:The palladium-catalyzed Suzuki Coupling reaction o-trifluoromethylated arylboronic acid 4 and vinyl triflate 5 provided the trifluoromethyl derivative of Targretin (LGD 1069).
Rebecca J Smith - One of the best experts on this subject based on the ideXlab platform.
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in situ raman spectroscopy as a probe for the effect of power on microwave promoted Suzuki Coupling reactions
Organic and Biomolecular Chemistry, 2007Co-Authors: Nicholas E. Leadbeater, Rebecca J SmithAbstract:We report the use of in situ Raman spectroscopy as a probe for the effect of power on microwave-promoted Suzuki Coupling reactions. We find that increased initial microwave power leads to greater acceleration of the reaction but that the product yield obtained is essentially independent of initial microwave power. The application of simultaneous cooling lengthens the reaction time but does not alter the relative rates of the Suzuki Coupling and deboronation processes. Performing the reaction at an initial microwave power of 5 W leads to an improvement in product yield.
Yasuhiko Yoshida - One of the best experts on this subject based on the ideXlab platform.
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synthesis of aromatic poly ether ketone s bearing optically active macrocycles through Suzuki Coupling polymerization
Polymer Journal, 2012Co-Authors: Katsuya Maeyama, Kenji Yamashita, Shunichi Aikawa, Hiromu Saito, Yasuhiko YoshidaAbstract:Pd-catalyzed Suzuki Coupling polymerization of macrocycle-containing monomer with diboric acid pinacol esters afforded aromatic poly(ether ketone)s with optically active macrocycles. The resulting aromatic poly(ether ketone)s have high glass transition temperatures (Tg: 220–257°C), large molar rotations ([Φ]D25: +1906–1976 deg) and excellent solubility to typical solvents such as CHCl3 and DMF.
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Synthesis of aromatic poly(ether ketone)s bearing optically active macrocycles through Suzuki Coupling polymerization
Polymer Journal, 2012Co-Authors: Katsuya Maeyama, Kenji Yamashita, Shunichi Aikawa, Hiromu Saito, Yasuhiko YoshidaAbstract:Pd-catalyzed Suzuki Coupling polymerization of macrocycle-containing monomer with diboric acid pinacol esters afforded aromatic poly(ether ketone)s with optically active macrocycles. The resulting aromatic poly(ether ketone)s have high glass transition temperatures ( T _g: 220–257°C), large molar rotations ([Φ]_D^25: +1906–1976 deg) and excellent solubility to typical solvents such as CHCl_3 and DMF. Palladium (Pd)-catalyzed Suzuki Coupling polymerization of macrocycle-bearing monomers, obtained through two-step nucleophilic aromatic substitution reactions with three types of diboric acid pinacol esters, produced aromatic poly(ether ketone)s that have optically active macrocycles composed of two 2,2′-dioxy-1,1′-binaphthyl-6,6′-diyl units and two aromatic ether ketone linkers. The macrocycle-bearing aromatic poly(ether ketone)s have excellent thermal and optical properties, that is, high glass-transition temperatures ( T _g: 220–257 °C) and large molar rotations ([Φ]_D^25: +1906–1976 deg). In addition, polyketones have excellent solubility in typical solvents such as CHCl_3 and N , N -dimethylformamide (DMF).